On Thu, 3 Dec 2015, brad wrote:

> dt1:uname -a
> Linux dt1 3.19.0-33-generic #38~14.04.1-Ubuntu SMP Fri Nov 6 18:17:28 
> UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
> 
> See attached for relevant kernel log.

The log was short enough to be included directly in the email message 
rather than as an attachment.  Here are the interesting parts:

Dec  3 09:06:50 dt1 kernel: [ 2388.047701] usb 1-1.4: new high-speed USB device 
number 4 using ehci-pci
Dec  3 09:06:50 dt1 kernel: [ 2388.140693] usb 1-1.4: New USB device found, 
idVendor=0d49, idProduct=7110
...
Dec  3 09:06:52 dt1 kernel: [ 2389.354586] sd 5:0:0:0: [sdb] Write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA
Dec  3 09:06:52 dt1 kernel: [ 2389.535697]  sdb: unknown partition table
Dec  3 09:06:52 dt1 kernel: [ 2389.716201] sd 5:0:0:0: [sdb] Attached SCSI disk
Dec  3 09:06:54 dt1 kernel: [ 2391.632947] blk_update_request: critical target 
error, dev sdb, sector 0
Dec  3 09:06:54 dt1 kernel: [ 2391.632991] JBD2: recovery failed
Dec  3 09:06:54 dt1 kernel: [ 2391.632997] EXT4-fs (sdb): error loading journal

> I have the error:
> blk_update_request: critical target error, dev sdb, sector 0
> JBD2: recovery failed
> EXT4-fs (sdb): error loading journal
> 
> which is the same as here:
> https://bugzilla.kernel.org/show_bug.cgi?id=89511#c2
> https://bugzilla.kernel.org/show_bug.cgi?id=89511#c4

Just because the error message is the same doesn't mean the bug has to 
be the same.

> >> sudo echo 'temporary write through'
> >>> /sys/block/sdb/device/scsi_disk/6\:0\:0\:0/cache_type
> >> and I'm getting an operation not permitted error no matter how I try it.

sudo and output redirection don't mix well.  Instead of doing it like
that, do this:

$ sudo -s
# echo 'temporary write through' >/sys/block/sdb/device/scsi_disk/*/cache_type
# exit

Alan Stern

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